Honestly just close up shots of stuff such as the cockpit interior and rotor assembly. The manual would be nice tho I'd prefer good color pictures since Id also be using them for painting reference.
I really want to get the DCS AH-64D but I'm broke, and I need some form of HOTAS and foot pedals, can't get them cuz, well, Im broke. But appreciate it. The Operator's Manual looks promising. If all else fails, I'll ask my classmate about whatever since he was a test pilot for the Apache. His laptops wallpaper is absolutely glorious: Its a picture of him flying in Afghanistan? I think. But the camera is pointed inwards but the landscape is almost perfectly reflected off of his helmet's visor. I want it so bad as my own wallpaper.
Sorry for the tangent.